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The vanos is a very slow moving devise. If you drive the car slow or cruise on the freeway it will take a long time for the seals to break in.
Driving the car hard will allow the vanos to move fast,...

I'm wondering what happened in your case. I know you replaced the vanos seals with the Beisan seals and didn't have an improvement. Then you replace the vanos solenoid pistons per my advice and that...